The spray of light scattered forward by these fields could push the object backward, against the movement of the beam itself.

光穿过这些场产生衍射，发散如喷雾状的衍射光向前方传播，因此对物体产生了一个与光束传播方向相反的推动。

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The spray nozzle layout scheme of fire sprinkler system with building structure beam was discussed through practical project example, and suggestion for structural design modulus was also put forward.

本文通过工程实例探讨了建筑结构梁对消防喷淋系统中喷头的布置方案，并对结构设计模数提出了建议。

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When the grillage beam structure is exposed outside, especially when the height and width of the beam are relatively large, the spray head layout will be greatly influenced.

当“井”字梁结构外露，特别是梁的高度与宽度都较大时，对消防喷头的布置带来很大影响。

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